Scientific Papers of the Bureau of Standards, Vol. 16, 715-723 (1920) Scientific Paper 402 (S402)
Gives reproductions of photomicrographs to show the value of ammonium persulphate as a revealer of crystalline heterogeneity and chemical inhomogeneity in iron. Various features are revealed by this means which would be missed if other etching agents were employed.
QC 1 .U52 v.16 1920 c.2
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